module.exports = function (playerAction) {
  var random = Math.random() * 3
  if (random < 1) {
    var computerAction = 'rock'
  } else if (random > 2) {
    var computerAction = 'scissor'
  } else {
    var computerAction = 'paper'
  }

  console.log('我出了' + computerAction)

  //比较
  if (computerAction === playerAction) {
    console.log('平局')
    return 0
  } else if ((computerAction === 'rock' && playerAction === 'paper') || (computerAction === 'scissor' && playerAction === 'rock') || computerAction === 'paper' && playerAction === 'scissor') {
    console.log('你赢了')
    return -1
  } else {
    console.log('你输了')
    return 1
  }
}